Unit tests for osism/tasks/conductor/ironic.py — pure helpers

[berendt]

Background

Follow-up to #2192 (foundation) and PR #2193 (pytest + Zuul infrastructure). Part of Tier 3 (#2199). osism/tasks/conductor/ironic.py is 1137 LOC, split across two sub-issues:

• This issue: pure helpers and the _prepare_node_attributes builder — the things you can test without exercising the full sync orchestration.
• Companion issue: the sync entry points (_sync_ironic_device, _sync_ironic_device_dry_run, sync_ironic, sync_netbox_from_ironic).

Scope

Add tests/unit/tasks/conductor/test_ironic_helpers.py covering the helpers below in osism/tasks/conductor/ironic.py.

Test targets

_derive_as_from_hostname_yrzn(hostname) — ironic.py:39

Pure function (already has a doctest example).

• "stor-nw-22-60-59-6" → "4200155960" (stor → type 5, rack 59, server 60)
• "comp-nw-22-3-7-1" → "4200143307" (non-stor → type 4, padded rack/server)
• Hostname with fewer than 5 parts → None
• Type ≠ "stor" (e.g. "net") → t="4"
• Server / rack already 2 digits → no further padding
• Single-digit rack/server padded with leading zero ("7" → "07")

_get_metalbox_primary_ip4_fallback() — ironic.py:67

Patch osism.tasks.conductor.ironic.utils.nb and osism.settings.NETBOX_FILTER_CONDUCTOR_IRONIC.

• Setting is invalid YAML → yaml.YAMLError caught, returns None
• Setting parses to a non-list → returns None
• Element that is not a dict → skipped
• Filter applied with tag removed and role="metalbox" added → verified via captured kwargs to nb.dcim.devices.filter
• First metalbox has primary_ip4="10.0.0.5/24" → returns "10.0.0.5" (prefix stripped)
• First metalbox has no primary_ip4 but second one does → returns the second IP
• All metalboxes have no primary_ip4 → returns None, warning logged
• No metalboxes returned by filter → returns None, warning logged

_get_metalbox_primary_ip4(device) — ironic.py:99

Patch get_device_oob_ip, osism.tasks.conductor.ironic.utils.nb, and _get_metalbox_primary_ip4_fallback.

• get_device_oob_ip returns None → returns None, fallback not called
• OOB IP 10.0.0.5, metalbox interface IP 10.0.0.1/24 → returns "10.0.0.1"
• OOB IP not in any metalbox subnet → fallback called, its result returned
• Metalbox in matching subnet but no primary_ip4 → returns None (no fallback call — note the early return None)
• Multiple metalbox interfaces, IP on second one matches → returns it
• IPv4 / IPv6 mixed addresses on the metalbox interfaces — only matching IPv4 is considered

_render_templates(obj, template_vars) — ironic.py:161

Pure recursive Jinja2 rendering. Build small dicts/lists inline.

• Flat dict with one Jinja value → key replaced with rendered string
• Nested dict → nested keys rendered
• Nested list → list elements rendered
• String without {{ → unchanged
• Non-string value (int, dict, None) → unchanged (only str with {{ triggers rendering)
• Multiple template vars → all available during rendering
• Modification is in-place (_render_templates(obj, vars) returns None, but obj is mutated)

_prepare_node_attributes(device, get_ironic_parameters, skip_kernel_params=None, extra_kernel_params=None) — ironic.py:184

Patch osism.tasks.conductor.ironic.deep_decrypt, ...deep_merge, ...get_vault, ...get_device_oob_ip, ...SUPPORTED_IPA_TYPES, ..._derive_as_from_hostname_yrzn, ..._get_metalbox_primary_ip4. Stub get_ironic_parameters to return a base dict.

Base merging

• Base dict (no config_context, no custom-field ironic_parameters) → returned with resource_class=device.name and extra={}
• device.config_context["ironic_parameters"] present → deep_decrypt + deep_merge invoked once for it
• device.custom_fields["ironic_parameters"] present → deep_decrypt + deep_merge invoked once
• Both present → both merged (verify call order: config_context first, then custom field)

Driver pruning

• driver="ipmi" and driver_info contains keys for redfish_* → those keys popped
• driver="redfish" and driver_info contains ipmi_* → those popped
• Unknown driver → no popping

Template variables

• node_secrets["remote_board_username"] / "remote_board_password" honored, defaults "admin" / "password"
• get_device_oob_ip returns ("10.0.0.5", 24) → template_vars["remote_board_address"] = "10.0.0.5"
• get_device_oob_ip returns None → key not present
• Secret keys starting with ironic_osism_ propagated into template_vars (stripped)

Kernel append params (osism-ipa-type=yrzn001)

• kap contains osism-ipa-type=yrzn001, frr_parameters populated → entries appended for osism-ipa-as, osism-ipa-ipv4, osism-ipa-ipv6
• frr_parameters missing the required keys → only available ones appended
• osism-ipa-metalbox resolved via _get_metalbox_primary_ip4 (returns IP → appended; returns None → not appended)
• osism-ipa-as falls back to _derive_as_from_hostname_yrzn(device.name) when frr_loopback_v4 not in frr
• Unknown osism-ipa-type → no enrichment

skip_kernel_params

• Param with key in skip_kernel_params (e.g. "osism-ipa-as") → removed; other params preserved

extra_kernel_params

• Each entry appended to kap with single space separator
• Empty kap becomes the first param (no leading space)

Driver_info persistence

• After kernel-param processing, final kap is also stored in driver_info["kernel_append_params"] (verify creation of driver_info if absent)

extra updates

• instance_info non-empty → JSON-serialized into extra["instance_info"]
• device.custom_fields["netplan_parameters"] truthy → JSON-serialized into extra["netplan_parameters"]
• device.custom_fields["frr_parameters"] truthy → decrypted then JSON-serialized into extra["frr_parameters"]
• All three absent → extra stays empty (or untouched)

Returns

• Returns (node_attributes, template_vars) tuple

_prettify_for_display(obj) — ironic.py:335

• Dict with extra={"instance_info": '{"foo": "bar"}'} → returns dict with extra["instance_info"] == {"foo": "bar"}
• Dict with non-JSON string in extra → string left untouched (caught JSONDecodeError)
• Dict without extra → returned unchanged (deep copy, not the same object)
• Non-dict input → returned as-is (deep copy)

Mocking hints

• Use mocker.patch(...) at the import site inside ironic.py so the original modules elsewhere stay intact.
• Stub deep_decrypt as a no-op (lambda obj, vault: None) — its real implementation is covered in Unit tests for osism/tasks/conductor/utils.py #2202.
• For _prepare_node_attributes, the inputs are deeply nested dicts; build them inline per test rather than via fixtures to keep each scenario self-contained.
• Build device with SimpleNamespace(name="server-1", custom_fields={...}, config_context={...}).

Definition of Done

• tests/unit/tasks/conductor/test_ironic_helpers.py created
• All listed cases covered
• pytest --cov=osism.tasks.conductor.ironic for the targeted helpers ≥ 90 %
• pipenv run pytest tests/unit/tasks/conductor/test_ironic_helpers.py passes locally
• flake8, mypy, python-black remain green
• Zuul job python-osism-unit-tests passes

Dependencies

• Part of Meta: Unit test coverage for osism/ #2199 (meta). Blocked by Introduce foundation for unit tests (pytest + Zuul CI integration) #2192 / PR Introduce foundation for unit tests (pytest + Zuul CI) #2193. The sync orchestrators in ironic.py are tracked in a companion sub-issue.